成果報告書詳細
管理番号20140000000104
タイトル*平成25年度中間年報 水素利用技術研究開発事業 燃料電池自動車及び水素ステーション用低コスト機器・システム等に関する研究開発 低コスト・プレクーラーの研究開発
公開日2015/4/25
報告書年度2013 - 2013
委託先名株式会社巴商会
プロジェクト番号P13002
部署名新エネルギー部
和文要約
英文要約Title: FY2013 Mid-year Report, R&D Project on Hydrogen Energy Utilization Technology, R&D of low cost equipment and system for fuel cell vehicles and hydrogen fueling stations, “R&D of low-cost pre-cooler” (2013-2014)

1. Piping materials
Materials procurement and acquisition of initial evaluation data will be conducted for HRX-19, which is planned to be used as piping material for the pre-cooler. Based on the data, a prior assessment application for specified facilities will be initiated in an attempt to obtain permission for tensile strength of 800MPa at 40°C.

(1) KHK hearing status
 In order to prepare for the KHK hearing, the following materials are obtained:
 a. HRX-19 piping manufacturing specification
 b. Measured values from each test regarding hydrogen characteristics
 c. Proof that the design life of HRX-19 is equal to or greater than that of SUS316

(2) Preparation of drawings for the inspection application for specified facilities
It is confirmed that the contents of the prior assessment application for specified facilities will be taken over by the inspection application for specified facilities, and the form and structure of the specified facilities should be determined at the point of the material special approval application. Therefore, the drawings are required and are in preparation.

  (3) Determination of delivery length of HRX-19
For HRX-19, it is confirmed that 30m length coiled pipe production is possible with the cold-finished seamless manufacturing process.

2. Coiled pipe attachment
Based on the design of the Powertech-made pre-cooler, which is small and has a high performance throughout the world, this R&D attempts to comply with domestic laws and pursues even higher performance. By optimization of each part, form factors will be determined to achieve a lower cost, and the structure will be determined while improving cooling performance.

(1) Structure of the heat exchanger and cooling performance
Taking into consideration responses to the domestic laws and the basic design of Powertech, optimization of each factor are being undertaken. Those factors include brine flow path, coil pitch, coil length, coil pipe diameter, brine type, and stockpile.

  (2) Composition of the heat exchanger unit
This pre-cooler will be used by aligning several heat exchange coils. The optimum composition to achieve a higher cooling performance can be examined by combining parallel and serial alignments properly.
a. Number of serial alignments of the heat exchanger unit
  Cardinal number that has a required heat transfer length for obtaining the target value of the hydrogen outlet temperature.
 b. Number of parallel alignment of the heat exchanger unit
Reduction of the pressure loss of hydrogen and brine under the allowable values.
 c. Cooling temperature control method
Attempt for optimization of the pinch point temperature difference of the hydrogen cooling temperature, and achieving an optimum reduction of freezing capacity.

 The factors described above are currently analyzed.

3. Improvement of the efficiency of a refrigeration system
For achieving lower cost and conserving space, downsizing will be pursued for a chiller unit and accessory refrigeration equipment, which account for more than half of the pre-cooler cost. Heat exchanger design information will be provided for the chiller unit manufacturers in order to design an optimized chiller unit and accessory refrigeration equipment. Meetings are held with five domestic chiller unit manufacturers, whose chiller unit will be combined with a forced convection heat transfer type heat exchanger with low temperature brine.
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